ATmega64A datasheet(284/392 Pages) ATMEL

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284

8160C–AVR–07/09

ATmega64A

Figure 26-2. Memory Sections

(1)

Note:

1. The parameters are given in Table 26-6 on page 292.

26.5

Boot Loader Lock Bits

If no Boot Loader capability is needed, the entire Flash is available for application code. The

Boot Loader has two separate sets of Boot Lock bits which can be set independently. This gives

the user a unique flexibility to select different levels of protection.

The user can select:

• To protect the entire Flash from a software update by the MCU.

• To protect only the Boot Loader Flash section from a software update by the MCU.

• To protect only the Application Flash section from a software update by the MCU.

• Allow software update in the entire Flash.

See Table 26-2 and Table 26-3 for further details. The Boot Lock bits can be set in software and

in Serial or Parallel Programming mode, but they can be cleared by a chip erase command only.

The general Write Lock (Lock bit mode 2) does not control the programming of the Flash mem-

$0000

Flashend

Program Memory

BOOTSZ = '11'

Application Flash Section

Boot Loader Flash Section

Flashend

Program Memory

BOOTSZ = '10'

$0000

Program Memory

BOOTSZ = '01'

Program Memory

BOOTSZ = '00'

Application Flash Section

Boot Loader Flash Section

$0000

Flashend

Application Flash Section

Flashend

End RWW

Start NRWW

Application flash Section

Boot Loader Flash Section

End RWW

Start NRWW

End RWW

Start NRWW

$0000

End RWW, End Application

Start NRWW, Start Boot Loader

Application Flash Section

End Application

Start Boot Loader

End Application

Start Boot Loader

End Application

Start Boot Loader

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